How to check inverter output.

4 Posts
Jan 27, 2010 08:45 am
How to check inverter output.

I have a Solarex 120w panel with a Microsine M100 inverter mounted on it. It was working fine when I took it down to do a reroof. I am selling the unit and want to know if everything is working ok. There are four wires coming out of the inverter.White,black,blue,orange. The blue /orange are the data com lines. I put the unit outside and checked for ac output from the white/black wires. Should there be voltage there without the ground(green wire) connected? I'm not reading any output. It isn't sunny but there should be some voltage. Thanks for the help. I had the unit installed and I'm not a PV expert.
578 Posts
Jan 27, 2010 01:28 pm
Re: How to check inverter output.

a grid tie inverter will not function unless it is connected to the grid.  so if you are merely checking with the unit outside but not connected properly, it should not function, nor show any voltage.

to actually check if it were working, it would have to be properly installed, and then a clamp on ammeter would have to be applied to the black wire, either inside or outside, as long as the circuit is closed.  with a 120w module, you may see anything at 1a or below for ampacity, but any current at 120vac would indicate that it was functioning.

if you were not going to install it by the way, those units still fetch a few people looking to pay top dollar for them.

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« Last Edit: Jan 28, 2010 11:09 am by James Cormican »
4 Posts
Jan 28, 2010 12:48 am
Re: How to check inverter output.

James, thank you for the answer.

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